linux-kernel - Re: [PATCH 4/5] serial: convert early

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Date:	Wed, 30 May 2007 21:48:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andi Kleen" <ak@...e.de>, "Russell King" <rmk@....linux.org.uk>,
	"Bjorn Helgaas" <bjorn.helgaas@...com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] serial: convert early_uart to earlycon for 8250

On Wed, 30 May 2007 21:36:41 -0700 "Yinghai Lu" <yhlu.kernel@...il.com> wrote:

> On 5/30/07, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> > On 5/30/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > On Tue, 29 May 2007 18:43:59 -0700 Yinghai Lu <Yinghai.Lu@....COM> wrote:
> > >
> > > > [PATCH 4/5] serial: convert early_uart to earlycon for 8250
> > >
> > > drivers/serial/8250_early.c: In function 'parse_options':
> > > drivers/serial/8250_early.c:143: error: 'FIX_EARLYCON_MEM_BASE' undeclared (first use in this function)
> > > drivers/serial/8250_early.c:143: error: (Each undeclared identifier is reported only once
> > >
> > > That was with http://userweb.kernel.org/~akpm/config-sony.txt, but this is
> > > going to break a whole pile of architectures (alpha, powerpc, others).
> >
> > alpha, powerpc, others may need sth like ia64, if they do not support fixmap.
> >
> >
> 
> or create dummy fixmap.h that doesn't support fixmap.
> 

You could require that the architecture implement some specific function
for mapping the early-uart.  Say,

void __iomem *map_early_uart(unsigned long phys_addr, unsigned long len);
void unmap_early_uart(void * __iomem *addr);

then, in drivers/serial/8250_early.c, do


void __iomem * __attribute__((weak))
map_early_uart(unsigned long phys_addr, unsigned long len)
{
	return ioremap(phys_addr, len);
}

void __attribute__((weak)) unmap_early_uart(void * __iomem *addr)
{
	iounmap(addr);
}

and in arch/i386/mm/ioremap.c



#ifdef CONFIG_something

void __iomem *map_early_uart(unsigned long phys_addr, unsigned long len)
{
	void __iomem * vaddr;
	set_fixmap_nocache(idx, phys & PAGE_MASK);
	vaddr = (void __iomem *)__fix_to_virt(idx);
	vaddr += phys & ~PAGE_MASK;

	return vaddr;
}

void unmap_early_uart(void * __iomem *addr)
{
	/* nothing to do */
}

#endif

or such.

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